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首先，后端项目springboot，前端项目VUE，两个都是运行在docker容器里，通过k8s进行编排的。

获取真实的客户端IP地址

一 需要在前端VUE的宿主nginx中，添加请求头规则

location /api {
			proxy_set_header Host $http_host;
			proxy_set_header X-Real-IP $remote_addr;
			proxy_set_header REMOTE-HOST $remote_addr;
			proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
			proxy_pass http://localhost:8080/;
}

二 分享springboot下面获取IP地址方法

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;


/**
 * Ip地址
 *
 */
public class IpUtils {
  private static Logger logger = LoggerFactory.getLogger(IpUtils.class);
  private static final String IP_UTILS_FLAG = ",";
  private static final String UNKNOWN = "unknown";
  private static final String LOCALHOST_IP = "0:0:0:0:0:0:0:1";
  private static final String LOCALHOST_IP1 = "127.0.0.1";

  /**
   * 获取IP公网地址
   * <p>
   * 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
   * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
   */
  public static String getIpAddr(HttpServletRequest request) {
    String ip = null;
    try {
      //以下两个获取在k8s中，将真实的客户端IP，放到了x-Original-Forwarded-For。而将WAF的回源地址放到了 x-Forwarded-For了。
      ip = request.getHeader("X-Original-Forwarded-For");
      if (StringUtils.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
        ip = request.getHeader("X-Forwarded-For");
      }
      //获取nginx等代理的ip
      if (StringUtils.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
        ip = request.getHeader("x-forwarded-for");
      }
      if (StringUtils.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
        ip = request.getHeader("Proxy-Client-IP");
      }
      if (StringUtils.isEmpty(ip) || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
        ip = request.getHeader("WL-Proxy-Client-IP");
      }
      if (StringUtils.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
        ip = request.getHeader("HTTP_CLIENT_IP");
      }
      if (StringUtils.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
        ip = request.getHeader("HTTP_X_FORWARDED_FOR");
      }
      //兼容k8s集群获取ip
      if (StringUtils.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
        ip = request.getRemoteAddr();
        if (LOCALHOST_IP1.equalsIgnoreCase(ip) || LOCALHOST_IP.equalsIgnoreCase(ip)) {
          //根据网卡取本机配置的IP
          InetAddress iNet = null;
          try {
            iNet = InetAddress.getLocalHost();
          } catch (UnknownHostException e) {
            logger.error("getClientIp error: {}", e);
          }
          ip = iNet.getHostAddress();
        }
      }
    } catch (Exception e) {
      logger.error("IPUtils ERROR ", e);
    }
    //使用代理，则获取第一个IP地址
    if (!StringUtils.isEmpty(ip) && ip.indexOf(IP_UTILS_FLAG) > 0) {
      ip = ip.substring(0, ip.indexOf(IP_UTILS_FLAG));
    }

    return ip;
  }

}

上面方法在k8s容器中，也是通用的。

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